Composite metal-coated polyester films with barrier properties

Details Composite metal-coated polyester films with barrier properties Composite metal-coated polyester films with barrier properties

C - Chemistry, Metallurgy

08

J

C08J 7/04 (2006.01) B32B 27/36 (2006.01) C09D 129/04 (2006.01)

Patent

CA 2295556

The invention concerns composite metal-coated polyester films with good barrier properties relative to gases. More precisely, it concerns a biaxially drawn composite metal-coated film based on polyester and having improved barrier properties relative to gases, characterised in that it comprises a base polyester film of 5 to 50 µm, coated on one of its two surfaces with a deposit containing polyvinyl alcohol and a water dispersible copolyester with sulphonyloxy units, the deposit containing polyvinyl alcohol and a water dispersible copolyester which is itself coated with a metal deposit, said composite film having permeability to oxygen measured at 23 °C under 50 % relative humidity, not more than 0.4 cm3/m2 24 h. The composite metal-coated films have, besides their barrier properties, excellent resistance to mechanical stresses, such as in particular crumpling.

La présente invention concerne des films composites métallisés à base de polyester ayant de bonnes propriétés barrière vis-à-vis des gaz. Plus précisément, elle concerne un film composite métallisé étiré biaxialement, à base de polyester et ayant des propriétés barrière vis-à-vis des gaz améliorées, caractérisé en ce qu'il comporte un film de base en polyester ayant de 5 mu m à 50 mu m, revêtu sur l'une de ses deux faces par une couche comportant de l'alcool polyvinylique et un copolyester hydrodispersable à motifs sulfonyloxy, la couche comportant l'alcool polyvinylique et le copolyester hydrodispersable étant elle-même revêtue d'une couche métallique, ledit film composite présentant une perméabilité à l'oxygène mesurée à 23 DEG C sous 50 % d'humidité relative, inférieure ou égale à 0,4 cm<3>/m<2>/24 h. Les films composites métallisés de l'invention présentent, outre leurs propriétés barrière, une excellente résistance aux agressions mécaniques, telles que notamment le froissage.

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